US2323422A - Sewing machine - Google Patents

Description

July 6, 1943. G. SAUER SEWING MAcHNE Filed July 11, 1940 '7 Sheets-Sheet l @Km0/@amg ATTORNEYS.

vJuly 6, 1943. G. SAUER 2,323,422 I SEWING MACHINE 'A Filed July 1l, 1940 7 Sheets-Sheet 2 WITNESSES.- 33 37 INVENTOR- W -BY George ,Sauefl l l' mfom/Esas'. y

, G. SAUER July 6, 1943.

SEWING MACHINE Filed July 11, 1940 7 sheets-sheet 5 W1 TNESSES lINVENTOR George ,Sauer7 BY @auf @mi ATTORNEYS.

G. SAUER SEWING MACHINE July 6, 1943.

Filed July 11, 1940 7 Sheets-Sheet 4 INVENTOR.- eorge Sauer] BY M v ATTORNEYS.

W I TNESSES July 6, 1943; G. sAUER 2,323,422

SEWING MACHINE Filed July 11, 1940 7 Sheets-Sheet 5 W I TNESSES: IN VEN TOR:

George Sazwrl' I' BY ATTORNEYS.

July 6, 1943. G. sAUER 2,323,422 y SEWING MACHINE A TTORNEYS July 6, 1943. G. SAUER SEWING MACHINE Filed July ll, 1940 '7 Sheets--ShemI '7 Ff@ la` Mexm? WITNESSES; IN1/@WOR l @l s ,w @zal/.ge naar] y? BY l/ ATTORNEYS.

Patented July 6, 1943 SEWING MACHINE- George Sauer, Berwyn, lll., assignor to Union Special Machine Company, Chicago, Ill., a corporation of Illinois Application July 1l, 1940, Serial No. 344,864

(ci. liz-256) 10 Claims.

This invention relates t sewing machines, and has reference more especially to sewing machines of the flat bed type with automatic lubrication systems which supply oil to the mechanism by which the stitch forming and feeding instrumentalities of the machines are actuated. With selflubricating machines of the kind referred to, las ordinarily constructed. diiliculty has been experienced on account of leakage of excess oil accumulation from the regions to which it is carried, for example, from the bottom of the needle headdown through the lower guide bearings for the needle and presser bars, from whence it from the region or regions where it is likely to I accumulate and returned to the supply in the base of the machine for re-use.

Another aim of my invention is to provide for the operation of the pump means without necessitating the use of power or the dependence upon memory of the machine operator, which latter objective I realize in practice as also hereinafter more fully disclosed, through connection of said pump means to a manual control associated with the machine, for example, the manual control for the presser bar, or that for a power transmitter from which it is driven.

Other objects and attendant advantages will appear from the following detailed description of the attached drawings, wherein Fig. 1 is a view partly infront elevation and partly in longitudinal section of a sewing machine conveniently embodying my invention.

Fig. 2 is a cross sectional view taken as indicated by the angled arrows II-,-lI in Fig. 1.

Fig. 3 is a fragmentary view showing the elevation of the needle head end of the machine with head cover removed.

Fig. 4 is a detail view on a larger scale corresponding to Fig. 1 and showing the 'construction of the pump means whereby the excess oil accumulation is drawn from the bottom of the needle head and returned to the supply in the base of the machine.

Fig. 5 shows the machine in rear elevation with the means whereby the pump is connected for operation to a knee press by which 4the presser foot of the machine is controlled.

Fig. 6 is a perspective view of the knee press.

Fig. 7 is a perspective view on the larger scale showing a stop associated with the knee-press.

Fig. 8 shows the elevation of the drive end of, another sewing machine provided'with the pump means of my invention and showing how said pump means can be operated by a treadle control for a power transmitter by which the machine is driven, portions of the machine frame having been broken out to expose important parts at the interior.

9 is a fragmentary view. in top plan of the organization shown in Fig. 8 likewise with a portion of the frame broken out to expose internal parts.

Fig. 10 is a fragmentary horizontal section taken as indicated by the angled arrows X--X in Fig. 8.

Fig. 11 is a detail sectional view taken as indicated by the angled arrows in Fig. 8.

Fig.' 12 is a view like Fig. 1 showing an alternative embodiment of my invention in which the pump is located within the needle head.

Fig. 13 shows the needle head of the machine of Fig. 12 in end elevationwith its cover removed.

Fig. 14 shows the end elevation of the needle head with portions of the cover plate broken out and the head partly in section. 1

Fig. 15 is a detail sectional view on a larger -scale taken as indicated by the angled arrows XV-XVin Fig. 12; and

Fig. 16 is a fragmentary detail section taken as indicated by the .angled arrows XVI-XVI in Figs. 13 and 15.

Referring first more particularly to Figs. 1-7, the frame of the machine there illustrated is formed as an integral structure with a dat hollow horizontal base 20 whereof the'top 2| serves as a work support which constitutes a main sump in which a supply of lubricating oil is normally maintained at the level L. and a communicating hollow standard 22 which rises from said base at one end and which sustains a. hollow communicating overhanging arm 23. As shown, the overhanging arm vterminates in a hollow needle head 24 which extends somewhat below the level of the arm with provision of an auxiliary sump for lubricating oil at its bottom, and which has a removable cover plate 25 at the front. Confined to endwise reciprocation by upper and lower guide bushings 26 and 21 within the head 2l. is

a vertical bar 28 with a needle 29 at its lower end. By means of a pitman 36 within the head 24, the needle bar is connected to a crank 3| on a rotary actuating shaft 32 vwhich extends longitudinally through the hollow of the overhanging arm 23 and which is journalled at opposite ends in bearings 33, 34, and at an intermediate point in a bearing lug 35 Within said arm. From Fig. 1 it will be noted that the shaft 32 extends through the right hand end bearing 34 to the exterior where it is provided with a combined hand and belt wheel 36. It is to be understood that suitable complemental stitch-forming instrumentalities, not shown, beneath the work support 2| cooperate with the -needle 28 in stitch formation. The feed mechanism of the machine includes a feed dog which is partly shown at 31 in Fig. 1, and which. through suitable connections shown at 38, is actuated from a. rotary shaft 38 extending horizontally of the machine base 20, said shaft 39 being connected to the needle shaft 32 for rotation in unison therewith by a train of intermeshing spur gears 40, 4|, 42 within the standard 22. Arranged to oppose the action of the feed dog 31 isa presser foot 45 which is connected to the lower end of the presser bar 46 extending upwardly into the needle head 24. A helical compression spring 41 surrounding the bar 46 within the needle head bears at its lower end upon the top of a collar 48 secured to said bar. The upper end of the spring 41. bears against an abutment sleeve 49 which serves as the upper bearing for the presser bar which sleeve is secured with capacity foi` endwise adjustability in the top of the needle head 24.

The presser foot 45 is manually controllable by the means about to be described. Extending longitudinally through the needle arm 23 is a rock shaft 50, which, within the needle head 24, carries a crank arm having a. link connection 52 with the collar 48 on the presser bar 46. The link connection 52 is pivoted `at 53 to a sleeve 54 freely mounted on the presser bar so that the presser bar can normally move up and down without interference in riding over thickness irregularities in the fabric being stitched. When the rock shaft 50 is oscillated to lift the presser foot, the upper end of the sleeve 54 will engage the lower face of the collar 48'and thus lift the presser bar to raise the presser foot free of the work. The arm 5| is subject to a torsion spring 55 which tends to urge'the link 52 downward. At its right hand end, Fig. 1, the rock shaft 50 passes through the bearing lug 35 and a portion Athereof is exposed in a recess 51 within said` lug, said recess being open at the back of the overhanging needle arm 23. Secured to the exposed portion of the rock shaft 50 within the recess 51 is an actuating lever arm 58 which extends outwardly of said recess from the back of the needle arm and which is connected by a drop link 60 to an arm 6| on a stud 62 at the back of the rear side wall of the base 20. Integrally formed with the arm 6| is a nger 63 which is adapted to be actuated by a knee press 65, see Figs. 5, 6 and 7. As shown, the knee press 65 includes a pair of brackets 66 which are secured in spaced relation to the bottom of the table 61 whereon the machine is supported. Journalled in the brackets 66 is a rock shaft 68 whereto is aiixed between said brackets, a nger 69 which is adapted to engage the nger 63 and a pendant rod arm whereto is secured, with capacity for vertical adjustment, a knee pad 1|.

Through cooperation of a stop 12 on the rock shaft 68 of the knee press 65 with the vertical web of one of the brackets 66, the pendant rod arm 60 i-s normally maintained by the spring 56 in the position shown in Fig. 5 through the train of connections reaching to the knee press, with the finger 69 touching the finger 63, the action of said spring being resisted by the stop member 12. Accordingly, as the knee pad 1| is moved toward the left in Fig. 5, the finger 63 is moved counterclockwise about the axis of the stud 62 with the result that through the link 60, counterclockwise motion is imparted to the rock shaft 50 with attendant lifting of the presser against action of a torsion spring 5| in a well known way. Since there is no positive connection between the fingers 63 and 69, it is evident that the machine may be tilted for access to the parts beneath the work support and afterwards righted without change in the operative relation of said ngers. When the machine is tilted,I the action of the torsion spring is resisted by engagement of an adjustable screw 64 on the arm 6| with a lateral stop projection on the machine base, see Fig. 5. A pan 13 (Fig. 5) is placed beneath the machine to catch any oil which may drip therefrom.

From Fig. 1 it will be observed that the lowermost gear of the train 40-42 dips into a supply of lubricating oil within the machine base 20, so that by rotation of the gear train, oil is taken from the supply and dispersed within'the standard, such'oil finding its way to the bearings for the upper shaft 32 and to the other parts within the overhanging arm 23. Some of the dispersed oil is caught in a small well 14 formed by an internal prolongation of the upper wall2| of the base 20 from which the oil flows by gravity through a horizontal duct in saidvwall to parts of the complemental stitch forming and the feed means at the needle end of the machine. Some of the dispersed oil is also caught in a trap 15 at oneend of a conduit or tube 16 which extends forwardly within the overhanging arm 23 and terminates in a small trough 11 within the hollow of the needle head 24. The oil so conducted is carried by means of tubes and wicks 1.8 which lead from the trough 11 of the conduit to the moving parts of the needle actuating mechanism.

'I'he provisions made in accordance with my invention for disposing of the excess oil which accumulates inthe auxiliary sump at the bottom of the needle head 24 are as follows: Depending from the internal extension of the top wall of the machine base 28 is a boss 80 which has a vertical bore 8| to constitute the cylinder of a reciprocating pump whereof the piston is indicated at 82. Screwed into the bottom of the bore 8| is a T fitting 83, and screwed in turn into the opposite ends of 'the horizontal portion of this fitting 83 are plugs 84 and 85 which respectively house ball valves 86 and 81 whereof the rst yields to pressure and the other to suction. Connected to the plug is a tube 88 which extends upwardly within the standard, then horizontally through the needle arm 23 to the needle head and thence downwardly into the sump at the botto-m of said head. At its terminal end, 'the tube is capped by a strainer 89. Referring to Figs. .1 and 2 the piston 82 of the pump is coupled by means of a vertical link 90 with an actuating arm 9| secured to the right hand end of the rock shaft 50 where the latter protrudes beyond the bearing lug 35. As a consequence of this arrangement, ,it will be seen that each time that the presser foot 45 is lifted through manipulation of the knee press 65, the piston 82 of the pump will be actuated and the oil accumulation within the needle head consein the machine base.

quently removed and returned to the supply with- By reference to Fig. 4, it will be seen that during the upward movement of the piston 82, the valve 85 will open under the suction created so that the oil is drawn from the tube 88 into the pump cylinder; while, when the piston descends, the valve 85 will close and the valve 86 will open under the pressure to permit discharge of the'oil from the cylinder into the machine base.

As shown in Figs. l and 2, the machine base 20 is closed at the bottom by a removable cover plate 92 which is secured with interposition of a sealing gasket 93, by a. number of screws 95 at suitably spaced points around the side walls of said l base. For convenience of access to the pump when necessary or desired, the cover plate 92 is provided with an opening 96, which in turn, is closed with interposition of a. sealing gasket 91 by a removable supplemental plate 98 secured by screws 99 to the main cover plate. Y

Reference will now be had to the embodiment of my invention shown in Figs. 8-11. The sewing machine there shown is, except as hereinafter noted, identical with that of Figs. 1-'l, and accordingly, in order to obviate repetitive description, all the corresponding parts have beenidentitled with the same reference numerals previously employed except for the addition in each instance of the letter a for convenience of ready distinction. In the alternative embodiment of Figs. 8-l1, the machine is arranged to be driven by an electric motor operated transmitter comprehensively designated by the numeral |00, whereof the pulley is coupled, through a belt |02 with the drive Wheel 36a of the sewing machine. The transmitter |00 may be of any approved type and is provided with a control lever |03 which actuates a clutch (not shown) for connecting and disconnecting the pulley I0 from the motor shaft. The transmitter control lever |03 is arranged to be actuated by a rod which extends through a foot treadle, not shown. The connection between lthe upper end of the rod |05 and the lever |03 is a flexible one and includes a spring, |06 which is in compression between a.co1lar |01 at the upper end of the rod and the top of the lever |03, another collar |08 below the arm normally serving to limit the free axial movement of the rod. In order that the control rod |05 for the transmitter |00 may also be utilized as a means for actuating the piston 82a of the needle head drain pump within the bottom of the standard 22a, I have provided means including a rock shaft |09 which is journalled in a fixed bracket l I0 beneath the machine support or table 61a.l Secured to one end of the shaft |09 is a rod arm whereon is adjustably secured an eye collarl ||2. By means of a chain ||3, the eye of the collar ||2 is-coupled with an eye on a collar |01 at the upper end of the control rod |05. At the other side of the. bearing ||0, the rock shaft |09 care ries another rod arm ||4 which is horizontally arranged as shown in Fig. 11 with its free end loosely engaging within the clevise of a collar ||5 at the lower end of a vertical thrust rod H6. As shown in Fig. 8, the rod I|6 .passes upwardly through the base of themachine for connection of its upper end to an arm which reaches outward from the rearwardly open recess 51a at the back of the overhanging frame arm 23 alongside the arm 58a on the rock shaft 50a of the presser bar control means within said frame arm. From Fig. 9, it will be noted that the arm is secured to a sleeve ||8 which is rotatively free on the rock shaft 50a and which extends toward the right beyond the bearing lug 35a. To the inner end of the sleeve ||8 is secured a horizontal arm ||9, which, through a drop link |20, isconnected to the upper end of the piston 82a of the pump 8|a whereof the piston or plunger 82a is provided near its top with a circumferential flange l2 A spring |22 surrounds thepiston '82a and is in compression between the top of the pump cyl' inder 8|a and the ange |2| at the top of said piston. From the construction just described, it

follows that when the rod |05 is shifted axially upward under the action of the foot treadle (not shown) to release the clutch of the transmitter |00, movement is communicated lthrough the rock shaft |09 and the rod ||6 upwardly to thearm with attendant depression through the arm ||9 and the link |20, of the pump piston 82a against the action of the spring |22 to force oil previously drawn into the pump cylinder 8 la from the needle head 24a back into the oil supply within the machine base 20a. Upon subsequent release of the treadle, the piston 82a will be raised by the spring |22 (this action being permitted by reason of the flexible connection H3) and draw the excess oil from the needle head 24a into the pump cylinder 8|a. 'I'he machine of Fig. 8, it will be noted, may, like themachine of Figs. 1-'7, be tilted relative to or entirely withdrawn from .the table and afterwards replaced without disturbing the relation between the pump actuating means and the transmitter control by reason of the loose connection between the finger I4 and the clevise collar ||5 at the bottom end of the thrust rod ||6. It is to be understood that the presser foot of the machine illustrated in Figs. 8-11 is adapted to be operated in the same way as describedin connection with the first embodiment of my invention by' a knee press which has been omitted from Figs. 8-10 in order to avoid complication 'and confusion.

Except as particularly pointed out presently, the alternative embodiment of my invention shown in Figs. 12-16 is identical with that shown in Figs. 1-7, and accordingly here again, in order y to obviate the necessity for duplicate description,

which the piston 82h operates being closed at the bottom by a screw plug |26. Extending laterally from the bottom of the bore |25 is a port |21 which is in axial registry with a horizontal bore |28 in the bottom wall of the needle head 24b, the latter bore in turn being in communication with an upwardly inclined bore |29, which, at its right hand front end in Fig. l2, is open into the hollow of the needle arm. Set into an enlarge'- ment of the bore |28 is a spring ball valve 86h which yields to pressure. Also extending crosswise of the bottom of the pump bore |25 ,within the end cover 25h of the needle head 24h yis a bore |30, which, at its rear. end, is closed by a screw plug |3|. From the duct |30, leads a lateral port |32 in direct register with a port |33 which opens into the oil collecting sump |34 at the interior of the needle head 24h (Figs. 15 and featured in Figs. 8-1 1.

16), said port |33 being enlarged to accommo-V date a suction responsive spring ball valve 81h. At its upper end, the piston B2b of the pump 8|b has a loose connection with a stud |35 projecting laterally from an arm |b, which latter, in this instance, is extended beyond the point of the pivotal connection of the link 52h therewith, see Figs. 13 and 14. The cover 25h is secured by screws |36 and between it and the face of the needle head 24h is interposed a gasket |31 to form an oil tight joint.

It is to be understood'that the machine of Figs. 12-16 may, according to my invention, be arranged for the operation of the pump by either a presser foot knee press control such as featured in Figs. 1 7,- or by a transmitter control such as It is to be further understood that my invention is lnot necessarily limited to the use of a reciprocating pump since other devices such as hereinbefore mentioned, as well as devices intended to be moved by hand.

, Having thus described my invention, I claim:

l. A sewing machine comprising stitch formk lng and feeding mechanism; a presser foot and manual control means therefor; means for supplying lubricating oil to said mechanism; a sump for collecting excess oil supplied to parts of-the mechanism; and means including a pump conzontally through the needle arm. and ,downwardly through the standard to the pump.

5. A sewing machine comprising a frame with a hollow base containing a supply of lubricating oil, a communicating hollow standard rising from the base and sustaining a communicating hollow overhanging arm with a hollow head at its free end whereof the bottom'extends below said arm; needle operating means within the head; an actuating shaft for the needle operating means extending longitudinally of the overhanging arm: means taking oil from the supply and dispersing it upwardly within the machine frame; means for conducting some of the dispersed oil to the needle head for lubrication of the needle operating means; an axially-shiftable presser bar extending upward into the head and having a presser foot at its lower end; manual control means for the presser foot including a rock shaft which extends longitudinally within the needle arm, and an actuating arm extending with prot vision for oil tightness, from the rock shaft to the exterior; and means for returning excess oil accumulation from the bottom of the needle head the presser foot control means.

Inected to the manual presser foot `Vcontrolj for ing the stitch forming and feeding mechanism and the pump; in which thel presser foot control includes a rock shaft within the frame whereto the pump is operatively connected; and in which an actuating arm on the rock shaft extends to the exterior of the frame with provision for oil-tightness.

3. A sewing machine comprising a frame with a hollow base containing a supply of lubricating oil, a communicating hollow standard rising from the base and sustaining a communicating hollow overha-nging arm' with a hollow head at its free end whereof the bottom extends below said arm; needle operating mearfs within the head, an actuating shaft for the needle operatingmeans extending longitudinally of the hollow of the overhanging arm; feed means, an actuating shaft for the feed means extending longitudinally of the hollow of the machine base; a train of transmission gears within the hollow of the standard connecting the two shafts which gears in their rotation take oil from the supply and disperse it upwardly within the machine frame; means for trapping some ofthe oil so dispersed and conducting yit to the needle head for lubrication of the needle operating means; a manual control means for rendering the machine operative or inoperative; and means includingV a normally inactive pump connected to the control means for actuation thereby to remove excess oil accumulation from the bottom of the needle head andfto return it to the supply in the machine base.

4. A sewing machine according to claim 3, in which the pump is located within the machine base; and in which an oil return conduit extends 6. A sewingmaehine comprising a frame with a hollow base containing ab supply of lubricating oil, a communicating hollow standard rising from the base and substaining a communicating hollow VAAoverhanging arm with a hollow head at its free "endswhereof the bottom extends below said arm;

axially shiftable presser bar extending upward up from the bottom of the needle head, horiinto the head and having a presser foot at its lower end; manual control means for the presser har including a rock shaft which extends longitudinally within the needle arm, a bearing lug within the needle arm for the rock shaft, said lug having a recess open to the exterior in which t a portion of the rock shaft is exposed, and an rotatively free on the rock shaft of the presser bar control and extending through one side of the bearing lug. in the needle arm into the recess of said lug, an arm on the inner end of the sleeve connected to the piston of the pump, and an outwardly-extending arm on the exposed end of the sleeve within the recess connected to the power drive means.

7. A sewing machine comprising a frame with a base and an overhanging ami which terminates in a hollow Ineedle head having an oil sump at the bottom thereof; stitch forming mechanism including needle actuating means within a portion of the needle head above the sump; means for conducting lubricating oil to the needle actuating means; manual means for rendering the machine operative or inoperative; a pump for intermittently removing the collected oil from the sump; and mechanical means connecting the pump with the manual control means for operation solely by the latter at each actuatio-n thereof in starting and stopping the machine..

8. A se'wing machine comprising a frame with a base and an overhanging arm which terminates in a hollowl needle head having an oil sump at the bottom thereof; stitch forming mechanism including needle actuating means within the needle head above the sump; means for conducting lubricating oil to the needle actuating means; manual means for rendering the machine opera--- tive or inoperative; a pump located within the needle head for removing the collected oil from the sump; and means connecting the pump With` the manual control means for operation by the latter only at each actuation thereof. A A

9. A sewing machine comprising a frame With a base and an overhanging arm which terminates in a hollow needle head having an oil sump at the bottom thereof, said needle head also having a removable end cover; stitch forming mechanism including needle actuating means within a portion of the needle head above the sump; means for conducting oil to the needle actuating means;

a manual control means for rendering the mal.

Chinebperative or inoperative; and means includi-ng a 'normally inactive pump connected to the main control means for actuation thereby to draw oi `the excess oil accumulation from the sump, said pump being of the reciprocating type and having its cylinder integrally formed with the needle head cover.

10. A sewing machine comprising aHM frame `for rendering` the machine operative or inoperative; a. pump for intermittently returning the oil accumulated in the auxiliary sump in the needle head to the main sump .in the machine base; and mechanical means connecting the pump to the manual control means for operation solely by the latter at each actuation thereof in starting and stopping the machine.

` GEORGE SAUER.

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